Re-organize all projects (#4166)

Content.Server/NodeContainer/EntitySystems/NodeGroupSystem.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using Content.Server.NodeContainer.NodeGroups;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.NodeContainer.EntitySystems
+{
+    [UsedImplicitly]
+    public class NodeGroupSystem : EntitySystem
+    {
+        private readonly HashSet<INodeGroup> _dirtyNodeGroups = new();
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<NodeContainerComponent, SnapGridPositionChangedEvent>(OnSnapGridPositionChanged);
+        }
+
+        private void OnSnapGridPositionChanged(EntityUid uid, NodeContainerComponent component, SnapGridPositionChangedEvent args)
+        {
+            foreach (var node in component.Nodes.Values)
+            {
+                node.OnSnapGridMove();
+            }
+        }
+
+        public void AddDirtyNodeGroup(INodeGroup nodeGroup)
+        {
+            _dirtyNodeGroups.Add(nodeGroup);
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            foreach (var group in _dirtyNodeGroups)
+            {
+                group.RemakeGroup();
+            }
+
+            _dirtyNodeGroups.Clear();
+        }
+    }
+}